190
Extension springs
Patented drawn spring steel wire in compliance
with EN 10270 part 1 type DH for all wire
diameters up to 1.9 mm. For diameters between
2.0 and 8.0 mm type SH will be used (A228 / BS
5216). Our stainless steel springs are manufac-
tured using spring steel wire material no. 1.4310
in compliance with EN 10270 part 3 (A301 / BS
301S21). The tolerances of the wire diameters
comply with EN 10270.
The springs are right-hand coiled (clockwise).
A 1/1 German loop in compliance with DIN 2097
is fixed to each end of the spring.
Each of our extension springs is available with a
choice of 2 different loop positions. One of the
positions is 180 ° (indicated in the table by an
catalogue number which ends with the letter "I").
In this case the loops are parallel, the loop ends
are set at 180°(as in a right-hand screw).
Loops are stocked without openings (m=0).
However it is possible to have an opening cut
into the loop at an extra cost, without causing
any delay.
Please contact our service department in
Metzingen and Cunewalde if you have any
questions about loops and positions.
Metzingen
Phone 0049 (0)7123 960-119, Fax -195
Cunewalde
Phone 0049 (0)35877 227-0, Fax -14
Extension springs made of spring-steel wire EN
10270-1-DH and -SH will be ligthly oiled after the
thermal coating. Springs made of material no.
1.4310 will not be re-coated after the thermal
coating, as a surface protection is not normally
required. All subsequent surface treatments
cause unavoidable delay, as the application of a
protective layer between the coils is very difficult
due to the preset nature of the spring body. Here
the selection of a suitable material should be
made for an additional surface coating.
The extension springs can also be delivered in
pre-galvanised material at an extra charge and
delivery time.
Extension springs can be used with the stated
deflections and loads by dead or infrequent
strains. In all other cases an arithmetical check of
the application of the spring should be carried
out. It is crucial to check the stresses at the point
of attachment of the loop to the body, as this is
the critical point for possible fractures. A longer
life-span can often be attained by choosing a
different loop type.
Please contact our service department in
Metzingen and Cunewalde if you have any
questions about load capacity.
Metzingen
Phone 0049 (0)7123 960-119, Fax -195
Cunewalde
Phone 0049 (0)35877 227-0, Fax -14
Material
Design
Loops
Loop position I
Surface treatment
Use
The other loop position is 270° (indicated by an
catalogue number which ends with an "X") In this
case the loops are positioned cross-wise. The
loop ends have been turned through 270°.
Loop position X
